Method of forming screw-couplings for pipes



I Mode1,)

HAMBAY.

METHOD OF FORMING SCREW COUPLINGS FOR PIPES.

No. 361.508. Patented Apr. 19, 188

' WITNESSES: v INVENTOR, DWAWM mww.

B W ST TZ RI V Y CUNITILD States Parent @ri rca.

JAMES T. HAMBAY, OF PITTSBURG, PENNSYLVANIA.

METHOD OF FORMING SCREW COUPLINGS FOR PIPES.

SPECIFICATION [arming part of Letters Patent No. 361,508, dated April 19, 1887.

\ Application filed January 28, [886. Serial No. 190,022.

To all whom it may concern.-

Be it known that I, J AMES T. HAMBAY, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in the Method of Forming IVrought-Iron or Steel Screw-Couplings, of which improvements the following is a specification.

In the accompanying drawings, which make part of this specification, Figures 1 and 2 are sectional elevations of dies employed in carrying out my improved method. Fig. 3 is a sectional elevation and a plan view of one of the dies employed in my improved method. Figs. 4, 5, and 6 are plan and transverse sectional views of the blanks. Fig. 7 is an edge View of the blank. Figs. 8, 9, and 10 are sectional views of the several parts of the screwcoupling. Fig. 11 is a sectional view of the parts of the coupling arrangedtogether.

Screw-couplings of the class to'which my invention relates are universally made of cast metal, and consequently have the defects inherent in the method of manufacturing and the material used in their construction.

The invention herein has for its object such improvements in the method of manufacturing such couplings asto render the same not only stronger and more elastic, but also free from any porosity or blow-h0les; and to this end my invention consists in the method, substantially as hereinafter more fully described and claimed.

The screw-coupling, as shown in Fig. 11, consists of three parts, to wit: the externally shouldered and threaded male part 1, the shouldered male part 2, and the internally threaded and shouldered female part or collar 3, said part 3 being constructed to slip over the part 2 until the internal shoulder, 4, on the collar 3 engages the exterior shoulder, 5, on the part 2, and also to engage the threads on the shoulder 6 of the part 1.

In making the parts land 2, I roll or otherwise form a blank, 8, of a'width equal to the length of said parts when completed, said blank being provided with a continuous rib, 9, along one edge, as shown, the rib?) on the blank to be used in forming the part1 of the coupling being (No model.)

made somewhat wider than on the blanks for the part 2, as said rib for the part 1 isto be threaded, as above stated. In case it is desired to form an overlapping joint between the parts 1 and 2, the blank for either of said parts, but preferably the part 2, is provided with a projecting lip, 10, as shown, Fig. 5, said lip forming the projecting collar or ring 11 in the co1n pleted part. (See Figs. 9 and 11.) These blanks are cut off in lengths equal to the circumference of the part to be formed, and are then bent around a suitable mandrel and their adjacent edges carefully welded together. These welded blanks are then placed in the die 12 or 13, the latter in case an overlapping joint is to be formed, and are pressed to final shape by the die 14 M15.

In making the female part 3 of the coupling, I form, by rolling or otherwise, a blank, 16, provided on one edge with a rib, 17, adapted to form the internal shoulder, 4, in the completed part. As the exterior surface of this part of the coupling is usually made hexagonal for engagement with the jaws of a wrench, the side of the blank opposite to that having the rib 17 is provided with a series of projections, 18, having curved grooves between them, as shown. The blank thus formed is divided into lengths equal to the circumference of the part 3 to be formed. Said lengths are then bent around a suitable mandrel and its adjacent ends welded together. ln bending the blank around the mandrel the curved surfaces between the projections 18 are flattened out, forming a hexagonal belt around the part 3, as will be clearly understood. This welded blank is then given its final shape by means of the dies 19 and 20-, the walls of the matrix in die 19 being given in a hexagonal contour, as clearly shown in Fig. 3.

In lieu of forming the parts 1, 2, and 3 from specially-shaped blanks they can be made from sections of plain welded pipe by compressing such sections in the dies shown in Figs. 1, 2,

and 3. The sections of plain pipe used for 9 this purpose should be sufficiently long and have their walls of such thickness as to provide sufficient metal for the formation of the shoulders or other projections on the several parts, 1, 2, and 3.

2. A wrought-iron or steel screw coupling or union consisting of the shouldered male parts 1 and 2, the shouldered portion of the part 1 being threaded, as described, in combination with the internally threaded and shouldered female part 3, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JAMES T. HAMBAY.

\Vitnesses:

DARWIN S. WOLOOTT, R. H. WHITTLESEY. 

